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I can understand that because in my system partner would tend to bid 1♠ if he had 3 card support in hearts to fall back on. However, remember that this is the beginner/intermediate forum, so it is fair to assume that partner is just denying 6 hcp.
Sure, I am not criticizing the original pass with 3 card support and a bust, which in "standard" is the only possibility (although I agree with you it's nice to be able to raise semi-preemptively, but that's outside of the scope of the thread).
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However, I agree with you that partner's double is unsound with 3 card hearts support. The 4♠ bid could easily have been made with a void heart.
That's exactly my point.
If I have to assume pard made a reasonable double, I expect him to have *not only long trumps* but also to be *short in my opened suit* (most likley a singleton after he plays small at the 1st trick).
This is because shortness in opener suit preserves the defensive potential
(if he held support for my suit, it is more likely that some of my honors are ruffed, reducing the number of our tricks) , and IMO a defensive shape is the only factor that can barely justify doubling when holding a hand so poor in hcp that had to pass a 1-level opening.
This inference is IMO big-time much stronger than the constrasting reasoning "Declarer would not have jumpbid 3S holding Jxx in hearts".
So the assumption that the double was reasonable led me to a wrong reconstruction of the shape of the hidden hands, hence to the wrong defensive plan.
Of course if I have to assume my pard doubles just with length in trumps, then anything goes.
"Bridge is like dance: technique's important but what really matters is not to step on partner's feet !"